One critical disadvantage for projected capacitive touch screen in critical conditions is: the unstability of the touchscreen, the touchscreen maybe activated by minimal unintentional pressure, strong fluctuations in temperature or even the close proximity of conductive materials.

So that Sphotoelec technology developed double touch solution for “no room for errors” application, safety, military, medical, etc. Think of medical procedures, military and industrial situations in which a drop of blood may activate the screen, in which a slight, unintentional touch may lead to very very serious consequences. Think of that if the touchscreen application is ATOM BOM...

We combine two touch technology, resistive touch plus capacitive touch technology together. Resistive touch is behind the Capacitive, while plus a very thin coverglass in front. The pcap is for touch tracking and the res is only for touch confirmation, Not for tracking. This means we need two input confirmed before a touch event will be released to the operation system.

So that the advantage is obvious: Extremely high operational reliability. 

You will never be worried about mistake activation anymore.